This examples shows how to add context-sensitive elements to a title bar and status bar. Each Page in the navigation uses AlternateRoot to add an item local to that page.
The first page uses a WhileActive trigger to add a button to the title bar while that page is active. This could be used for a share menu, or other context sensitive activity.
The second page adds an indicator to the status bar if the Switch is on. This persists outside of this page, remaining on the status bar so long as the switch remains on.